using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Haoliang.Models.System;
using Haoliang.Data.Repositories;

namespace Haoliang.Data.Repositories
{
    public interface ISystemConfigRepository : IRepository<SystemConfig>
    {
        Task<SystemConfig> GetByKeyAsync(string configKey);
        Task<bool> DeleteByKeyAsync(string configKey);
        Task<bool> KeyExistsAsync(string configKey);
        Task<IEnumerable<SystemConfig>> GetByCategoryAsync(string category);
        SystemConfig UpsertAsync(SystemConfig config);
        Task<string> GetValueAsync(string configKey);
        Task<bool> SetValueAsync(string configKey, string value);
        Task<IEnumerable<SystemConfig>> GetActiveConfigsAsync();
        Task<SystemConfig> GetDefaultConfigAsync();
        Task<bool> UpdateConfigValueAsync(string configKey, string value);
    }

    public class SystemConfigRepository : Repository<SystemConfig>, ISystemConfigRepository
    {
        private readonly CNCDbContext _context;

        public SystemConfigRepository(CNCDbContext context) : base(context)
        {
            _context = context;
        }

        public async Task<SystemConfig> GetByKeyAsync(string configKey)
        {
            return await _context.SystemConfigs
                .FirstOrDefaultAsync(c => c.ConfigKey == configKey);
        }

        public async Task<bool> DeleteByKeyAsync(string configKey)
        {
            var config = await GetByKeyAsync(configKey);
            if (config != null)
            {
                _context.SystemConfigs.Remove(config);
                await SaveAsync();
                return true;
            }
            return false;
        }

        public async Task<bool> KeyExistsAsync(string configKey)
        {
            return await _context.SystemConfigs
                .AnyAsync(c => c.ConfigKey == configKey);
        }

        public async Task<IEnumerable<SystemConfig>> GetByCategoryAsync(string category)
        {
            return await _context.SystemConfigs
                .Where(c => c.Category == category)
                .OrderBy(c => c.ConfigKey)
                .ToListAsync();
        }

        public SystemConfig UpsertAsync(SystemConfig config)
        {
            var existing = _context.SystemConfigs
                .FirstOrDefault(c => c.ConfigKey == config.ConfigKey);

            if (existing != null)
            {
                // Update existing
                existing.ConfigValue = config.ConfigValue;
                existing.Description = config.Description;
                existing.UpdatedAt = DateTime.Now;
                existing.IsActive = config.IsActive;
                existing.Category = config.Category;
                _context.SystemConfigs.Update(existing);
            }
            else
            {
                // Insert new
                config.CreatedAt = DateTime.Now;
                config.UpdatedAt = DateTime.Now;
                _context.SystemConfigs.Add(config);
            }

            SaveAsync();
            return config;
        }

        public async Task<string> GetValueAsync(string configKey)
        {
            var config = await GetByKeyAsync(configKey);
            return config?.ConfigValue;
        }

        public async Task<bool> SetValueAsync(string configKey, string value)
        {
            var config = await GetByKeyAsync(configKey);
            if (config != null)
            {
                config.ConfigValue = value;
                config.UpdatedAt = DateTime.Now;
                await SaveAsync();
                return true;
            }
            return false;
        }

        public async Task<IEnumerable<SystemConfig>> GetActiveConfigsAsync()
        {
            return await _context.SystemConfigs
                .Where(c => c.IsActive)
                .OrderBy(c => c.Category)
                .ThenBy(c => c.ConfigKey)
                .ToListAsync();
        }

        public async Task<SystemConfig> GetDefaultConfigAsync()
        {
            return await _context.SystemConfigs
                .FirstOrDefaultAsync(c => c.IsDefault);
        }

        public async Task<bool> UpdateConfigValueAsync(string configKey, string value)
        {
            var config = await GetByKeyAsync(configKey);
            if (config != null)
            {
                config.ConfigValue = value;
                config.UpdatedAt = DateTime.Now;
                await SaveAsync();
                return true;
            }
            return false;
        }
    }
}